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Schedule III - Supplementary Insurance Information
 12 Months Ended
Dec. 31, 2021
SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information [Abstract]  
Schedule III- Supplementary Insurance Information
($ in thousands)Deferred
policy
acquisition costs		Reserve
for loss
and loss expense		Unearned premiumsNet
premiums earned
Net
investment income1
Loss
and loss
expense incurred		Amortization
of deferred
policy
acquisition costs
Other
operating expenses2
Net
premiums written
Standard Commercial Lines Segment$279,850 3,832,151 1,346,809 2,443,885 — 1,426,768 539,606 278,915 2,593,018 
Standard Personal Lines Segment12,911 270,066 317,276 293,559 — 212,116 25,918 51,559 292,265 
E&S Lines Segment34,154 478,686 139,122 279,809 — 175,100 60,945 27,734 304,430 
Investments Segment— — — — 344,188 — — — — 
Total$326,915 4,580,903 1,803,207 3,017,253 344,188 1,813,984 626,469 358,208 3,189,713 
1Includes “Net investment income earned” and “Net realized and unrealized investment gains (losses)” on the Consolidated Statements of Income.
2“Other operating expenses” of $358,208 reconciles to the Consolidated Statements of Income as follows:
Other insurance expenses$375,931 
Other income(17,723)
Total$358,208 

See accompanying Report of Independent Registered Public Accounting Firm in Item 8. "Financial Statements and Supplementary Data." of this Form 10-K.
 Year ended December 31, 2020
($ in thousands)Deferred
policy
acquisition costs		Reserve
for loss
and loss expense		Unearned premiumsNet
premiums earned
Net
investment income1
Loss
and loss
expense incurred		Amortization
of deferred
policy
acquisition costs
Other
operating expenses2
Net
premiums written
Standard Commercial Lines Segment$246,494 3,596,340 1,196,243 2,143,184 — 1,245,627 474,322 271,504 2,230,636 
Standard Personal Lines Segment13,803 228,348 308,183 299,140 — 233,260 30,694 50,694 295,166 
E&S Lines Segment28,281 435,667 113,845 239,490 — 156,936 55,255 27,173 247,290 
Investments Segment— — — — 222,890 — — — — 
Total$288,578 4,260,355 1,618,271 2,681,814 222,890 1,635,823 560,271 349,371 2,773,092 
1Includes “Net investment income earned” and “Net realized and unrealized investment gains (losses)” on the Consolidated Statements of Income.
2“Other operating expenses” of $349,371 reconciles to the Consolidated Statements of Income as follows:
Other insurance expenses$366,941 
Other income(17,570)
Total$349,371 

See accompanying Report of Independent Registered Public Accounting Firm in Item 8. "Financial Statements and Supplementary Data." of this Form 10-K.

Year ended December 31, 2019
 
($ in thousands)Deferred
policy
acquisition costs		Reserve
for loss and loss expense		Unearned premiumsNet
premiums earned
Net
investment income1
Loss
and loss
expense incurred		Amortization
of deferred
policy
acquisition costs
Other
operating expenses2
Net
premiums written
Standard Commercial Lines Segment$226,464 3,436,363 1,108,009 2,049,614 — 1,187,856 445,661 270,107 2,137,071 
Standard Personal Lines Segment16,848 224,200 309,125 307,739 — 211,300 34,477 53,702 304,592 
E&S Lines Segment27,874 406,600 106,033 239,818 — 152,335 55,835 21,905 237,761 
Investments Segment— — — — 236,965 — — — — 
Total$271,186 4,067,163 1,523,167 2,597,171 236,965 1,551,491 535,973 345,714 2,679,424 
1Includes “Net investment income earned” and “Net realized and unrealized investment gains (losses)” on the Consolidated Statements of Income.
2“Other operating expenses” of $345,714 reconciles to the Consolidated Statements of Income as follows:
Other insurance expenses$358,069 
Other income(12,355)
Total$345,714 

See accompanying Report of Independent Registered Public Accounting Firm in Item 8. "Financial Statements and Supplementary Data." of this Form 10-K.